VVER

1971

I generation

VVER-440

  • Leak-tight enclosure (containment);
  • 2 trains of active safety systems;
  • autonomous operation time in case of a BDBA with a loss of power — 2 hours.
1980

II generation

VVER-440, VVER-1000

  • Single containment;
  • 3 trains of active safety systems;
  • passive safety systems: stage I accumulators (4 pcs);
  • core catcher;
  • autonomous operation time in case of a BDBA with a loss of power — 4 hours.
2000

I generation

VVER-440

  • 3 trains of active safety systems;
  • passive safety systems: stage I accumulators;
  • autonomous operation time in case of a BDBA with a loss of power — 2 hours.
2015

III+ generation

VVER-1200

NVNPP-2

  • 2 trains of active safety systems (with 100% backup);
  • passive safety systems:
  • — stage I accumulators (4 pcs);
  • — stage II accumulators (8 pcs);
  • — SPOT SG;
  • double containment;
  • core catcher;
  • autonomous operation time of a unit in case of a BDBA with a loss of power without limitations;
  • autonomous operation time of NPP in case of a BDBA with a loss of power (LOCA) — 24 hours.

LNPP-2

  • 4 trains of active safety systems; passive safety systems:
  • — stage I accumulators (4 pcs);
  • — SPOT SG;
  • — SPOT of leak-tight enclosure; 
  • double containment;
  • core catcher;
  • autonomous operation time of a unit in case of a BDBA with a loss of power without limitations;
  • autonomous operation time of NPP in case of a BDBA with a loss of power (LOCA) — 24 hours.

Perspective project

III+ generation

VVER-TOI

(Kursk NPP-2)

  • Double containment;
  • 2 trains of active safety systems (with 100% backup);
  • passive safety systems — passive safety systems: stage I accumulators (4 pcs), stage II accumulators (8 pcs), SPOT (afterheat removal passive system) SG (steam generator);
  • core catcher;
  • autonomous operation time of a unit in case of a BDBA with a loss of power without limitations;
  • autonomous operation time of NPP in case of a BDBA with a loss of power (LOCA) —72 hours.
VVER-TOI reactor unit
VVER-TOI reactor unit